In 5.0 the 25 second build time is the same as the call-in cooldown for Osstruppen in live(also same as Grenadier build time I believe). If you reduce it any then you undermine the whole point of moving them to T1. Even a slight reduction in build time would cancel out the build time of T1 and the 80 MP delay to the next Ostruppen built.
Sandbags might be okay with the build time increase since they get them eventually and wouldn't affect late game scaling. They would need tested and maybe have build time longer than other sandbags at Vet 0 if needed. Molotovs would be hell playing as Brits as Ostruppen are already hyper MP efficient vs Tommies and constantly denying cover in a commander that typically floats munitions is a non-starter. You can't buff their combat much since their performance currently isn't an issue and you can't really have Ostruppen scaling too well or they become a no-brainer over Grens again.
You are missing the point Ostruppen.
At first the commander become popular because it allowed player to cap the map fast. So the MOD team had them start on CD and increased their CD and the commander was forgotten.
The commander become popular again when rushing T2 become more viable. Moving them to T1 removed that bonus and will make commanders not viable again.
Glad to see that you agree about the sandbags.
Think you are over reacting about molotovs since without ourah or the long range of incendiary grenades range with terrible RA modifier and with horribly out of cover DPS they will not be that great offensively.
Claiming that Ostheer is floating munition is not very accurate.
I have not suggested to improve their combat efficiency, my suggestions aim at increasing their utility. In preview there is very little reason to build them over grenadier even more so since the rest of the commander abilities are nothing special and even more so larger modes.